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Cat intelligence is the considered capacity of learning, thinking, problem solving, reasoning, and adaptability possessed by the domestic cat. Intelligence in cats is demonstrated by the capacity to develop and use tools, learn new behavior techniques, apply previously acquired knowledge to new situations, communicate needs and desires within social groups, and respond to training cues. Mammalian neuroscientists have attempted to simulate the feline brain in order to understand the origins and operation of cat intelligence, but results to date are inconclusive and additional study is needed.

Brain Size and Surface Area

The brain of a cat

The brain size of the average cat is 5 centimeters in length and 30 grams. Since the average cat is 60 cm long and 3.3 kg,[1] the brain makes up 1/12 of its length and 1/110 of its mass. Thus, the average cat's brain accounts for 0.9 percent of its total body mass, compared to 2 percent of total body mass in the average human. The surface area of a cat's cerebral cortex is approximately 83 cm². The modern human cerebral cortex is about 2500 cm².[2] Cat brains have been shown to be more similar to human brains than dog brains, and the part of the brain for emotions is the same in both cats and humans.[3] According to researchers at Tufts University School of Veterinary Medicine, the physical structure of human brains and that of cats are very similar; they have the same lobes in the cerebral cortex (the "seat" of intelligence) as humans do.[citation needed] Human brains also function the same way, conveying data via many identical neurotransmitters.[citation needed]

Intelligence by Breed

Ranking the intelligence of cats by breed is popular among pet owners, veterinarians and others, but the practice tends to run into difficulties. In general, the subject of cat intelligence rankings tends to be subjective. Cat breeder Norman Auspitz states the following: "As a rule, people seem to think the more active breeds have higher intelligence than the less active breeds. I will tell you that in feline agility, all breeds have done very well or very poorly as the case may be. Having said that, there is no certified measure of cat intelligence and this general rule may be very anthropomorphic... until there is a credible definition of what might be meant by cat intelligence and a way to measure it, any comment anyone will make about the subject is, at best, speculation."[17]

Observed Abilities of Cats

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Inventing and using a tool

At least one cat was documented by a scientist to have adapted an object for use as a tool to add water to dry cat food, this tool-use being invented by the cat without any prior training by humans.[18]

Opening doors and windows

Cats that are accustomed to being let outside, or that want to get into their home, may learn to open windows and doors. They are capable of learning different routes for entry and exit; for instance a cat might find the window in its owner's kitchen easier to open to exit the house, but to get in, they might have to use the screen door in the backyard. Also, they may learn to open cupboard doors to get to food. Cats' paws are not as effective as manipulation as human hands, owing to lack of an opposable thumb, but they can for instance learn to operate door lever handles by pulling them down, even though gripping the handle is difficult for cat paws.

Retrieving items from hard to reach places

A cat playing with a ball may suddenly find that the ball is under the couch. The cat will try different ways, changing paws, position, and other elements, the way a human would. This trial and error approach to puzzle solving can be demonstrated in the laboratory using Thorndike's puzzle boxes. In these boxes, cats must manipulate series of levers in order to escape. They initially achieve this by trial and error, before committing the sequence to memory. They also use memory to reduce the amount of trial and error when encountering comparable novel situations e.g. new puzzle boxes.[4] The cat may also be taught to get treats from high and hard to reach places, like on top of a refrigerator, or in a cupboard. Using the same logic as it did with the toy, the cat will get to each treat. A cat that has figured out where the cat food is kept may find that the food is inside a large bag. It might try to get in the bag or open it by means of removing the clip.

Using the toilet

Toilet trained cat

Because of their sensitive sense of smell, some cats prefer going outside to urinate and defecate, and rarely go in the same spot twice. Kittens are typically trained by their mothers to use a litter box and cover up their waste, so litter training rarely requires human intervention; once they understand where the litter box is, they will seek it out from then on. Cats can also be trained to make use of a toilet;[19] some cats learn on their own after watching their owners, but for most cats, it is necessary to be taught by owners. In general, however, a toilet-trained cat is a rare animal, and successful toilet training depends both on the willingness of the animal to learn as well as on the patience of the owner to teach.

Playing fetch

Some cats can be trained to play fetch with a varied degree of success (which is dependent on the cat and its mood). Siamese, Bengals and Burmese cats are well-regarded as breeds that naturally carry objects in their mouths. They are easy to train to fetch and carry. Other breeds such as the Maine Coon, Turkish Van, Savannah,Short Hair and Turkish Angora, are also well known for an almost dog-like affinity for playing fetch. It is possible to get a cat to remain seated until an object is thrown. At that point, their sense of sight kicks in. As long as there is at least a remote chance of locating the thrown item, the cat will run off to find it. Once retrieved, waiting or a simple call is enough for the cat to return with the item and deposit it (usually) within arm's reach. Chasing an object in the air is a natural cat hunting behavior, and many cats will chase down a thrown toy for the sheer enjoyment of running and catching.

Communication

Cats, like many animals, communicate in a social environment in various ways. Some aspects of this behaviour are simple, such as purring to express the desire for and enjoyment of attention, meowing near the food bowl to get fed, some remember what time they get fed and attempt to gain their owner's attention at that time every day, etc, and some are more complex. Domestic cats organize themselves in complex social units when food is plentiful and conditions are otherwise conducive to it. It is actually quite important to cats' welfare to understand that they are not 'solitary by nature.' Although they do not socialize in the same way that dogs do (they do not hunt in packs, for example, and are not responsive to praise and blame in the same way) they still associate themselves strongly with specific other animals (including humans) and are probably even more attached to place and routine than dogs or their human owners.

Training and Tricks

Cats are traditionally hard to train as circus animals, mainly because cats appear to only assume such behaviors in exchange for a direct benefit, unlike dogs which respond well to emotional reassurance.[citation needed] While this is usually true, a human with a good relationship to a cat, where there is trust and good communication, can find a cat to be almost as trainable as a dog. A good example of this is The Yuri Kuklachev Cat Theatre based in Moscow[20] , the owner of which has been training cats for many years to do a full range of circus style tricks. Also there is the belief that cats are harder to train than dogs owing to impatience and boredom with the training exercise.[citation needed] Like dogs and people, many cats have active minds that thrive on stimulation, exploration and learning. Many of the same basic methods of training a dog—shaping behavior, and giving reinforcement in the form of treats, lavish praise or attention for correct responses—work extremely well when training a cat. A cat can be taught to "sit" for treats or meals; this or other such repeatable behaviour responses can act as a foundation for further training.

There are a number of reasons the cat brain is a goal of computer simulations. Cats are a familiar and easily-kept animal, so the physiology of cats has been particularly well studied. The physical structure of human brains and cat brains are very similar.[3] Cats, like humans, have binocular vision that gives them depth perception.[25]